Improvement in rubber erasers



E. W. FROST.

Rubber Erasegs.

N0. 137,299, PatentedAprilL1873.

igh e} real 3 3 UNITED STATES PATENT OFFICE.

.EZRA W. FROST, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN RUBBER ERASERS.

Specification forming part of Letters Patent No. 137,299, dated April 1,1873; application filed March 6, 1873.

To all whom it may concern:

Be it known that I, EZRA W. FROST, of Brooklyn, Kings county, New York,have invented certain new and useful Improvements relating to RubberErasers, of which the following-is a specification:

I provide a rigid holder securely fitted, covering the main body of theeraser and allowin g the edges to project. The holder is adapted toallow the finger and thumb to enter or partially enter. The holder forthis reason forms a more convenient handle than any before known. to me.

The accompanying drawing forms a part of this specification, andrepresents what I con sider' the preferable means of carrying out thedevice.

Figure l is a side elevation; and Fig. 2, a central section.

Similar letters of reference represent like parts in both the figures.

The body is represented with eight angles and eight straight sides. Thenumber may be increased or diminished at pleasure. The

material may be pure vulcanized rubber or analogous gum, or the samemixed with various earthy or other materials to produce an efiicienteraser for pencil marks or ink, or both. A considerable hole is formedin the middle of the sheet A, the material thus removed being utilizedfor other purposes. A metallic grummet, analogous to those used insails, is applied to cover a considerable portion of each face, the twosides taking a firm hold on the rubber material by reaching through thecentral hole. One face is formed by the part B,

which spreads out on one side of the eraser and reaches through inbranches, by means of the split portions B B B, and clenches on theother side of the eraser. The other face is formed by the part (3, whichis correspondingly spread on the opposite face of the device, andreaches through the central hole, and is spread, like an eyelet,concentrically within the face B on the opposite side, as is indicatedby O.

The work may be rapidly effected by suitable dies. The parts B B U 0 maybe of Germ an silver or other fine metal, or a coarse metal plated.

I can realize nearly the same benefit by simply riveting through therubber with a slender rivet, which shall entirely fill a small holeproduced; but in such case the faces should be struck up in dies orotherwise formed so as to be concave at and near their centers, andallow the hand to get the same firm hold as by partially entering thelarge hole shown.

I claim- As a new article of manufacture, the centrally-hollowed eraserdescribed, having the hollow face-pieces B O secured together throughthe erasive material A, and adapted to serve as herein specified.

In testimony whereof I havehereunto set my hand this 3d day of March,1873, in the pres- V ence of two subscribing witnesses. I

EZRA W. FROST.

Witnesses WM. (J. DEY, ALFD. WESTBROOK.

